I feel a little bad to say so, because this is really a well done drawing... but your Quetzalcoatl doesn't look much like a serpent to me. It looks like a scaly horse. The ridges over the eyes paired with the shape of the snout just doesn't look snake-like to me.

Nothing quite like a beautiful woman taming a beast many times her size and strength. Every line in this drawing is such a marvel to look upon and study with envy. Awesome work! I hope someone will come forward to color it someday.